Large mixing building construction raft foundation and construction method thereof

Abstract

The invention discloses a large mixing building construction raft foundation and a construction method thereof, and relates to the field of mixing building foundation construction. An external penetrating reinforcing steel bar assembly is arranged on the outer side of a raft body in a penetrating mode; the outer end of the external penetrating steel bar assembly is in butt joint with a nesting butt joint assembly in a nesting mode, the outer end of the nesting butt joint assembly is fixedly connected with a reserved supporting steel bar assembly, and the other end of the reserved supporting steel bar assembly is fixedly connected with the other nesting butt joint assembly. According to the large mixing building construction raft foundation and the construction method thereof, through the nested butt joint assemblies which are in nested butt joint, the outer sides of the multiple externally-arranged penetrating steel bar assemblies which are arranged in a penetrating mode can be rapidly subjected to nested butt joint supporting, and the two nested butt joint assemblies form a crossed supporting state through the fixed reserved supporting steel bar assemblies; the multiple sets of reserved supporting steel bar assemblies can form a staggered X-shaped supporting structure, the supporting strength among the multiple external penetrating steel bar assemblies is stably and efficiently improved, and the overall supporting strength is improved.

Description

Technical Field

[0001] The invention relates to the technical field of mixing plant foundation construction, in particular to a large-scale mixing plant construction raft foundation and a construction method thereof. Background Art

[0002] The concrete mixing system mixing plant is a purchased complete set of equipment with a steel upper structure. In order to ensure the stability and reliability of the foundation of the mixing plant and reduce the amount of foundation treatment engineering, the mixing plant is designed to be arranged on a dense original soil layer. The foundation design adopts a raft foundation, and the foundation bearing capacity is required to be no less than 300kPa. It will be reviewed after receiving the geological survey data;

[0003] To ensure overall stability, the raft foundation requires a certain burial depth, and the bottom of the foundation is replaced with graded crushed stone for backfilling. The treatment depth is temporarily considered to be 2.0m, and the compaction coefficient is not less than 0.97. After the layered rolling backfill is in place, a 10cm thick C15 concrete cushion is poured in time to prevent rainwater from entering the foundation, and then the foundation concrete is poured;

[0004] During the working process of the raft slab, the whole interior is a cast-in-place structure, and the steel support structure inside is mostly directly penetrated, and the supporting strength between them is limited when they are subjected to force;

[0005] For example, the Chinese patent with publication number CN113897993A, a prefabricated raft foundation and construction method, belongs to the field of raft technology in building construction. It includes a prefabricated body, the left side and the front side of the prefabricated body are provided with a first connection structure, the right side and the rear side of the prefabricated body are provided with a second connection structure that matches the first connection structure, and a plurality of exposed steel bar heads are reserved around the prefabricated body, and each steel bar head is provided with an external thread. After the connecting hook body and the connecting groove are adapted, the auxiliary hook body is installed inside the connecting groove, and the connecting hook body is tightly sealed. After installation, the steel bar heads on the two prefabricated bodies are effectively installed as a whole through the threaded sleeve pre-installed on one of the steel bar heads. At this time, the connection strength between the prefabricated bodies will be greatly improved, and finally the joint seams are treated by pouring a higher grade of waterproof concrete;

[0006] For example, the Chinese patent with publication number CN114215380A discloses a construction method for extending the raft foundation of an existing building. The foundation soil is excavated at one end of the original raft foundation of the existing building to be extended to the bottom plane of the original concrete cushion layer at the bottom of the original raft foundation. The original waterproof layer on the side wall of the original raft foundation to be extended is removed to a specified height H, the contact surface between the new and old concrete is roughened, the new raft foundation waterproof layer is overlapped with the original waterproof layer, a number of horizontal reinforcement holes are drilled on the side wall of the original raft foundation from which the original waterproof layer has been removed, and then the new concrete cushion layer is poured, followed by the new raft foundation waterproof layer, and then reinforcement is poured, and finally the new raft foundation concrete is poured. This can ensure the integrity of the new and old raft foundations and meet the waterproofing requirements;

[0007] For example, the Chinese patent with publication number CN116005706A discloses a flat plate assembled raft foundation and construction method. The flat plate assembled raft foundation includes a column bottom plate, an inter-column plate and a mid-span plate. The column bottom plate is provided with a first steel section and a second steel section. The inter-column plate is arranged between two adjacent column bottom plates in the horizontal or vertical direction, and a third steel section is arranged in the inter-column plate. The mid-span plate is arranged in a rectangular space enclosed by the inter-column plates. The first steel section and the third steel section, the second steel section and the third steel section, and two adjacent third steel sections are connected by steel connection components, and the transversely arranged mid-span plates and the transversely arranged inter-column plates and mid-span plates are connected by mid-span connectors. The provided flat plate assembled raft foundation, the column bottom plate, the inter-column plate and the mid-span plate can be prefabricated in the factory.

[0008] Most of the above-mentioned existing technologies are for their overall structure, and the existing large-scale mixing plant construction raft foundation and its construction method have limited supporting strength. When it is in vertical or longitudinal contact with a larger supporting strength, the steel bars penetrating therein are prone to breakage, which leads to certain limitations in its use. Summary of the invention

[0009] The purpose of the present invention is to provide a raft foundation for large-scale mixing plant construction and a construction method thereof, so as to solve the problem mentioned in the above background technology that the supporting strength is limited, and when it contacts a larger supporting strength vertically or longitudinally, the steel bars penetrating inside it are prone to breakage, which leads to certain limitations in its use.

[0010] To achieve the above object, the present invention provides the following technical solution: a large-scale mixing building is constructed with a raft foundation, comprising a raft body and an external through-steel assembly, wherein the external through-steel assembly is provided through the outside of the raft body;

[0011] The outer end of the external through-steel component is nested and docked with a nested docking component, and the outer end of the nested docking component is fixedly connected to a reserved support steel bar component, and the other end of the reserved support steel bar component is fixedly connected to another nested docking component, and an auxiliary locking structure is arranged on the outer side of the nested docking component, and the relative position between the nested docking component and the external through-steel component is quickly and auxiliaryly fixed by the auxiliary locking structure;

[0012] An auxiliary support structure is arranged on the outside of the reserved support steel bar assembly, and the bearing strength between the reserved support steel bar assemblies is improved by the auxiliary support structure. The nested docking assembly can quickly support the outside of multiple external through-steel assemblies that are set through the nested docking, and a cross-support state is formed between the two nested docking assemblies through the fixed reserved support steel bar assembly.

[0013] Further preferably, the auxiliary locking structure is provided with a reserved groove for accommodating docking, and the reserved groove for accommodating docking is opened inside the nested docking component, and the inner side of the nested docking component is docked with a threaded fastening docking piece, and at the same time, the threaded fastening docking piece is docked with the nested docking component through the reserved groove for accommodating docking, and when the vertical or longitudinal contact has a larger supporting strength, the steel bar portion penetrating therein will not be damaged.

[0014] Further preferably, a first external threaded layer is provided on the outer side of the external through-steel bar assembly, a built-in reserved thread groove is provided on the inner side of the threaded fastening joint piece, and the threaded fastening joint piece is butt-jointed with the first external threaded layer through the built-in reserved thread groove on the inner side.

[0015] Further preferably, the reserved supporting steel bar assemblies are staggeredly distributed about the center point of the external through-steel steel bar assemblies, and nested docking assemblies are respectively fixed at both ends of the reserved supporting steel bar assemblies, and the nested docking assemblies cooperate with threaded fastening docking pieces to nest and dock with the outer sides of the external through-steel steel bar assemblies to form a cross-support structure.

[0016] Further preferably, the threaded fastening docking piece forms a rotating structure along the outer side of the nested docking component, and the threaded fastening docking piece is threadedly connected to each other through the inner built-in reserved thread groove and the first external threaded layer on the outer side of the external through-steel component. As the nested docking component is nested and docked with the external through-steel component at the corresponding position, it can be quickly threadedly fastened and positioned with the first external threaded layer on the outer side of the external through-steel component by rotating the outer threaded fastening docking piece. Through the threaded fastening docking piece structure with automatic positioning structure, the user does not need to provide additional fastening accessories.

[0017] Further preferably, the auxiliary support structure is provided with a second external thread layer, and the second external thread layer is opened on the outside of the reserved support steel bar assembly. After the positioning of the two groups of staggered reserved support steel bar assemblies is completed, the user can also rotate the built-in reserved thread movable kit on the inner side of the movable docking piece to adjust its position along the second external thread layer on the outer side of the reserved support steel bar assembly;

[0018] The outer side of the reserved supporting steel bar assembly is nested and docked with a movable docking piece, and the inner side of the movable docking piece is provided with a built-in reserved threaded movable kit, and the built-in reserved threaded movable kit is docked with the second external threaded layer, and the outer side of the movable docking piece is fixedly connected with a resisting supporting docking piece, and the built-in reserved threaded movable kit and the movable docking piece are rotationally connected.

[0019] Further preferably, the abutting support joint piece and the movable joint piece are an integrated structure, and the movable joint piece is nested and jointed with the outer side of the reserved support steel bar assembly.

[0020] Further preferably, the movable docking piece is threadedly docked with the second external threaded layer on the outside of the reserved supporting steel bar assembly through the built-in reserved threaded movable kit, and a resistance support structure is formed between the interference support docking piece on the surface of the cross-arranged reserved supporting steel bar assembly and the outside of another reserved supporting steel bar assembly, and a resistance support structure is formed between the interference support docking piece on the outside of the movable docking piece and the outside of another reserved supporting steel bar assembly, thereby stably ensuring the secondary support strength between multiple cross-distributed reserved supporting steel bar assemblies and further improving their overall bearing performance.

[0021] The construction method of the raft foundation of a large mixing plant includes the following steps:

[0022] S1: Nested butt-jointed components are nested along the outer side of the external through-steel components, and two sets of nested butt-jointed components are cross-jointed between four external through-steel components to form an X-shaped support structure;

[0023] S2: After the nested docking assembly is nested and docked with the external through-steel assembly at the corresponding position, the outer threaded fastening docking piece is rotated to quickly fasten the first external threaded layer on the outer side of the external through-steel assembly, and the cross-supporting work is achieved through the self-locking structure of the threaded fastening docking piece of the automatic positioning structure;

[0024] S3: Rotate the built-in reserved threaded movable kit on the inner side of the movable joint, and adjust the position along the second external threaded layer until a secondary support of the interference support structure is formed between the interference support joint on the outer side of the movable joint and the outer side of another reserved support steel bar assembly, thereby improving the overall bearing performance.

[0025] The advantages and beneficial effects of the present invention are:

[0026] 1. The large-scale mixing building construction raft foundation and the construction method thereof of the present invention can quickly perform nested docking support on the outer sides of multiple external through-steel components through nested docking, and a cross-shaped support state is formed between two nested docking components through a fixed reserved support steel bar component. Multiple groups of reserved support steel bar components can form a staggered X-shaped support structure, which stably and efficiently improves the support strength between multiple external through-steel components, improves the overall support strength, and when the vertical or longitudinal contact has a larger support strength, the internal through-steel parts will not be damaged, thereby improving the practicality of the overall device;

[0027] 2. The large-scale mixing building construction raft foundation and the construction method thereof of the present invention are provided with an auxiliary locking structure. As the nested docking assembly is nested and docked with the external through-steel assembly at the corresponding position, it can be quickly fastened and positioned with the first external threaded layer on the outside of the external through-steel assembly by rotating the threaded fastening docking piece on the outside. Through the threaded fastening docking piece structure of the automatic positioning structure, the user does not need to match extra fastening accessories. The two groups of reserved support steel bar assemblies positioned by the threaded fastening docking piece can stably perform cross-support work, thereby improving its overall convenient support effect;

[0028] 3. The large-scale mixing plant construction raft foundation and the construction method thereof of the present invention are provided with an auxiliary support structure. After the positioning of the two groups of staggered reserved support steel bar assemblies is completed, the user can also rotate the built-in reserved threaded movable kit on the inner side of the movable docking piece to adjust its position along the second external threaded layer on the outer side of the reserved support steel bar assembly until a conflicting support structure is formed between the interference support docking piece on the outer side of the movable docking piece and the outer side of another reserved support steel bar assembly, thereby stably ensuring the secondary support strength between the multiple cross-distributed reserved support steel bar assemblies and further improving its overall bearing performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0030] Figure 2 This is a schematic diagram of the three-dimensional structure of the external through-steel assembly of the present invention;

[0031] Figure 3 A schematic diagram of the three-dimensional structure of a support steel bar assembly is reserved for the present invention;

[0032] Figure 4 For the present invention Figure 3 The enlarged structural diagram at A in the middle;

[0033] Figure 5 A schematic diagram of the three-dimensional structure of a support steel bar assembly is reserved for the present invention;

[0034] Figure 6 It is a half-section three-dimensional structural schematic diagram of the threaded fastening joint of the present invention;

[0035] Figure 7 It is a schematic diagram of the three-dimensional structure of the interference support docking piece of the present invention;

[0036] Figure 8 It is a schematic diagram of the three-dimensional structure of the built-in reserved thread groove of the present invention.

[0037] In the figure: 1. raft body; 2. external through-steel assembly; 3. nested docking assembly; 4. reserved support steel bar assembly; 5. reserved docking groove; 6. threaded fastening docking piece; 7. first external thread layer; 8. internal reserved thread groove; 9. second external thread layer; 10. movable docking piece; 11. interference support docking piece; 12. internal reserved thread movable kit. DETAILED DESCRIPTION

[0038] The present invention is further described in detail below through specific examples. The following examples are only illustrative and not restrictive, and the protection scope of the present invention cannot be limited thereto.

[0039] Example 1: Please refer to Figure 1-Figure 8 The present invention provides the following technical solution: a raft foundation for large-scale mixing building construction, comprising a raft body 1, an external through-steel component 2, a nested docking component 3, a reserved support steel bar component 4, a reserved docking groove 5, a threaded fastening docking piece 6, a first external threaded layer 7, a built-in reserved threaded groove 8, a second external threaded layer 9, a movable docking piece 10, a conflicting support docking piece 11, and a built-in reserved threaded movable kit 12;

[0040] An external through-steel component 2 is provided through the outside of the raft body 1;

[0041] The outer end of the external through-steel component 2 is nested and docked with a nested docking component 3, and the outer end of the nested docking component 3 is fixedly connected with a reserved support steel bar component 4, and the other end of the reserved support steel bar component 4 is fixedly connected with another nested docking component 3, and an auxiliary locking structure is provided on the outer side of the nested docking component 3, and the relative position between the nested docking component 3 and the external through-steel component 2 is quickly and auxiliary fixed by the auxiliary locking structure;

[0042] The auxiliary locking structure is provided with a reserved groove 5 for accommodating docking, and the reserved groove 5 for accommodating docking is opened inside the nested docking component 3, and the inner side of the nested docking component 3 is docked with a threaded fastening docking piece 6, and the threaded fastening docking piece 6 is docked with the nested docking component 3 through the reserved groove 5 for accommodating docking. A first external thread layer 7 is provided on the outer side of the external through-steel component 2, and an internal reserved thread groove 8 is provided on the inner side of the threaded fastening docking piece 6, and the threaded fastening docking piece 6 is docked with the first external thread layer 7 through the internal reserved thread groove 8.

[0043] The reserved support steel bar components 4 are staggered about the center point of the external through-steel component 2, and the two ends of the reserved support steel bar components 4 are respectively fixed with nested docking components 3, and the nested docking components 3 cooperate with the threaded fastening docking parts 6 to nest and dock with the outer side of the external through-steel component 2 to form a cross-support structure. The threaded fastening docking parts 6 form a rotating structure along the outer side of the nested docking components 3, and the threaded fastening docking parts 6 are threadedly connected to each other through the inner built-in reserved thread groove 8 and the first external thread layer 7 on the outer side of the external through-steel component 2. The nested docking components 3 of the nested docking can quickly perform nested docking support on the outer sides of multiple external through-steel components 2 that are set through. A cross-shaped support state is formed between the two nested docking components 3 through the fixed reserved support steel bar components 4. Multiple groups of reserved support steel bar components 4 can form a staggered X-shaped support structure, which improves the support strength between the multiple external through-steel components 2 and improves the overall support strength. When the vertical or longitudinal contact has a larger support strength, the steel bars that penetrate inside will not be damaged. As the nested docking components 3 are nested and docked with the external through-steel components 2 at the corresponding position, they can be quickly threaded and fixed with the first external threaded layer 7 on the outer side of the external through-steel components 2 by rotating the outer threaded fastening docking piece 6. Through the threaded fastening docking piece 6 structure of the automatic positioning structure, the user does not need to match extra fastening accessories. The two groups of reserved support steel bar components 4 positioned by the threaded fastening docking piece 6 can stably perform cross-support work, thereby improving the overall convenient support effect.

[0044] Embodiment 2:

[0045] On the basis of the first embodiment, an auxiliary support structure is also disclosed, and its specific structure is as follows:

[0046] An auxiliary support structure is arranged on the outer side of the reserved support steel bar assembly 4, and the bearing strength between the reserved support steel bar assemblies 4 is improved by the auxiliary support structure.

[0047] The auxiliary support structure is provided with a second external thread layer 9, and the second external thread layer 9 is opened on the outside of the reserved support steel bar assembly 4;

[0048] The outer side of the reserved support steel bar assembly 4 is nested with a movable docking piece 10, and the inner side of the movable docking piece 10 is provided with a built-in reserved thread movable set 12, and the built-in reserved thread movable set 12 is docked with the second external thread layer 9, and the outer side of the movable docking piece 10 is fixedly connected with a resistance support docking piece 11, and the built-in reserved thread movable set 12 is rotatably connected with the movable docking piece 10. The resistance support docking piece 11 and the movable docking piece 10 are an integrated structure, and the movable docking piece 10 is nested and docked with the outer side of the reserved support steel bar assembly 4. The movable docking piece 10 is threadedly docked with the second external thread layer 9 on the outer side of the reserved support steel bar assembly 4 through the built-in reserved thread movable set 12, and a resistance support structure is formed between the resistance support docking piece 11 on the surface of the cross-set reserved support steel bar assembly 4 and the outer side of another reserved support steel bar assembly 4.

[0049] Embodiment 3: The construction method of the large mixing plant raft foundation comprises the following steps:

[0050] S1: nesting and docking the nested docking assemblies 3 along the outer side of the external through-steel assemblies 2, and cross-docking two groups of nested docking assemblies 3 between four external through-steel assemblies 2 to form an X-shaped support structure;

[0051] S2: After the nested docking assembly 3 is nested and docked with the external through-steel assembly 2 at the corresponding position, the outer threaded fastening docking piece 6 is rotated to quickly thread-fasten the first external threaded layer 7 on the outer side of the external through-steel assembly 2, and the cross-supporting work is achieved through the self-locking structure of the threaded fastening docking piece 6 of the automatic positioning structure;

[0052] S3: Rotate the built-in reserved threaded movable kit 12 on the inner side of the movable docking piece 10, and adjust the position along the second external threaded layer 9 until a secondary support of the interference support structure is formed between the interference support docking piece 11 on the outer side of the movable docking piece 10 and the outer side of another reserved support steel bar assembly 4, thereby improving the overall bearing performance.

[0053] The user can quickly perform nested docking support on the outer sides of multiple through-set external through-steel components 2 through the nested docking components 3, and a cross-shaped support state is formed between the two nested docking components 3 through the fixed reserved support steel bar components 4;

[0054] Multiple groups of reserved supporting steel bar assemblies 4 can form a staggered X-shaped supporting structure, which can stably and efficiently improve the supporting strength between multiple external through-steel assemblies 2;

[0055] When the vertical or longitudinal contact has a large supporting strength, the internally penetrated steel bar portion will not be damaged. As the nested docking component 3 is nested and docked with the externally penetrated steel bar component 2 at the corresponding position, it can be quickly threaded and fixed with the first external threaded layer 7 on the outside of the externally penetrated steel bar component 2 by rotating the outer threaded fastening docking piece 6;

[0056] Through the threaded fastening docking piece 6 structure of the automatic positioning structure, the user does not need to match extra fastening accessories. The two groups of reserved supporting steel bar assemblies 4 positioned by the threaded fastening docking piece 6 can stably perform cross-support work, thereby improving its overall convenient support effect.

[0057] Although the embodiments and drawings of the present invention are disclosed for illustrative purposes, those skilled in the art will appreciate that various substitutions, changes and modifications are possible without departing from the spirit and scope of the present invention and the appended claims. Therefore, the scope of the present invention is not limited to the contents disclosed in the embodiments and drawings.

Claims

1. A raft foundation for large-scale mixing plant construction, comprising a raft body (1) and an external through-steel assembly (2), wherein the external through-steel assembly (2) is provided through the outside of the raft body (1); Features: The outer end of the external through-steel component (2) is nested and docked with a nested docking component (3), and the outer end of the nested docking component (3) is fixedly connected to a reserved support steel bar component (4), and the other end of the reserved support steel bar component (4) is fixedly connected to another nested docking component (3), and an auxiliary locking structure is provided on the outer side of the nested docking component (3), and the relative position between the nested docking component (3) and the external through-steel component (2) is quickly and auxiliary fixed by the auxiliary locking structure; An auxiliary support structure is provided on the outer side of the reserved support steel bar assembly (4), and the auxiliary support structure is used to increase the bearing strength between the reserved support steel bar assemblies (4).

2. The large-scale mixing plant construction raft foundation according to claim 1 is characterized by: The auxiliary locking structure is provided with a docking reserved groove (5), and the docking reserved groove (5) is opened inside the nested docking component (3), and a threaded fastening docking piece (6) is docked on the inner side of the nested docking component (3), and the threaded fastening docking piece (6) is docked with the nested docking component (3) through the docking reserved groove (5).

3. The large-scale mixing plant construction raft foundation according to claim 2 is characterized by: The outer side of the external through-steel bar assembly (2) is provided with a first external thread layer (7), the inner side of the threaded fastening butt joint piece (6) is provided with an internal reserved thread groove (8), and the threaded fastening butt joint piece (6) is butted against the first external thread layer (7) via the internal reserved thread groove (8).

4. The large-scale mixing plant construction raft foundation according to claim 3 is characterized by: The reserved support steel bar components (4) are staggeredly distributed about the center point of the external through-steel component (2), and nested docking components (3) are respectively fixed at both ends of the reserved support steel bar components (4), and the nested docking components (3) cooperate with the threaded fastening docking pieces (6) to nest and dock with the outer sides of the external through-steel components (2) to form a cross-support structure.

5. The large-scale mixing plant construction raft foundation according to claim 4 is characterized by: The threaded fastening joint piece (6) forms a rotating structure along the outer side of the nested joint assembly (3), and the threaded fastening joint piece (6) is threadedly connected to the first external thread layer (7) that penetrates the outer side of the steel bar assembly (2) through the internal reserved thread groove (8) on the inner side.

6. The large-scale mixing plant construction raft foundation according to claim 3 is characterized by: The auxiliary support structure is provided with a second external thread layer (9), and the second external thread layer (9) is opened on the outside of the reserved support steel bar assembly (4); The outer side of the reserved support steel bar assembly (4) is nested with a movable docking piece (10), and the inner side of the movable docking piece (10) is provided with a built-in reserved thread movable set (12), and the built-in reserved thread movable set (12) and the second external thread layer (9) are mutually docked, and the outer side of the movable docking piece (10) is fixedly connected with a resisting support docking piece (11), and the built-in reserved thread movable set (12) and the movable docking piece (10) are rotationally connected.

7. The large-scale mixing plant construction raft foundation according to claim 6 is characterized by: The abutting support joint piece (11) and the movable joint piece (10) are an integrated structure, and the movable joint piece (10) is nested and jointed with the outer side of the reserved support steel bar assembly (4).

8. The large-scale mixing plant construction raft foundation according to claim 7 is characterized by: The movable docking piece (10) is threadedly docked with the second external threaded layer (9) on the outside of the reserved support steel bar assembly (4) through the built-in reserved thread movable set (12), and the interfering support docking piece (11) on the surface of the cross-arranged reserved support steel bar assembly (4) forms an interfering support structure with the outside of another reserved support steel bar assembly (4).

9. A construction method for implementing the raft foundation of a large mixing plant as claimed in claim 8, characterized in that: The steps include: S1: nesting and docking the nested docking components (3) along the outer side of the external through-steel components (2), and cross-docking two sets of nested docking components (3) between four external through-steel components (2) to form an X-shaped support structure; S2: After the nested docking assembly (3) is nested and docked with the external through-steel assembly (2) at the corresponding position, the outer threaded fastening docking piece (6) is rotated to quickly thread-fasten the first external threaded layer (7) on the outer side of the external through-steel assembly (2), and the cross-supporting work is achieved through the self-locking structure of the threaded fastening docking piece (6) of the automatic positioning structure; S3: Rotate the built-in reserved thread movable kit (12) on the inner side of the movable docking piece (10) to adjust the position along the second external thread layer (9) until a secondary support of the interference support structure is formed between the interference support docking piece (11) on the outer side of the movable docking piece (10) and the outer side of another reserved support steel bar assembly (4), thereby improving the overall bearing performance.

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